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GeckoFlex 8921ADT 4-Channel Analog Audio to Digital Audio Converter w/Delay Tracking

The 8921ADT provides conversion of four channels of analog audio to two digital audio streams. In addition to conversion, it offers two forms of delay. These delays are summed—a fixed delay of up to 1.5 seconds and a variable delay based on a signal from video decoders fitted with frame synchronizers or directly from a frame sync board, enabling adjustment for large, fixed lip sync errors while continually adjusting audio delay to match video delay created by the frame synchronizer. Operational modes allow modification to the outgoing signal, such as levels, channel swapping, channel summing, and phase inversion plus channel pairing for the digital audio streams. Many adjustments to this board can be performed directly on the board card-edge controls, while a few of the more complex adjustments require the web-based interface or the Newton control panel.

  • User-selectable 48 kHz or 96 kHz sampling rates
  • 24-bit ADC A-to-D conversion
  • >105 dB A weighted signal-to-noise ratio
  • Independent control of each audio channel including channel pairing, level adjustment, swapping, summation, phase inversion, delay up to 1.5 seconds, test tone generation
  • Auto tracking delay of video frame synchronizers (8900FSS, 8981FS)
  • Four inputs, two pairs of balanced High Z analog audio inputs:
    • Supports levels up to +30 dBu
  • Looping reference input supports NTSC/PAL color black, AES signal, 48 kHz or 96 kHz DARS
  • Options:
    • 8900-A-CBL package of four cables, breakout cable package converts three-pin balanced AES audio to dual 75Ω BNCs, unbalanced AES audio
    • 8900-GFA-CBL package of four cables, breakout cable package for GeckoFlex 8900A-R rear board with three-terminal to dual BNCs converts balanced AES audio to dual 75Ω, unbalanced AES audio
Supported Chassis Types
GeckoFlex with 8900A-R GeckoFlex Audio rear board, Gecko audio chassis: 8900TX-A, 8900TF-A, 8900TFN-A

Power Rating
4.7 Watts – single slot

Analog Inputs
Number of inputs: Four balanced
Impedance: >22 kΩ
Common mode input voltage: 20V maximum
Connector: Three-pin mini-terminal strip

Reference Input
Number of inputs: One differential loop-through
Impedance: High Z loop-through
Input return loss: >40 dB 100 kHz to 10 MHz @ 75Ω
Common mode input voltage: ±1V maximum

Digital Outputs
Number of outputs: Three balanced and one unbalanced per channel
Signal type:
  • Balanced: AES-3id-1992
  • Unbalanced: AES-3id-2001
Output voltage level:
  • Balanced: 3 Vp-p ±0.2V @ 110Ω
  • Unbalanced: 1 Vp-p ±0.2V @ 75Ω
Output impedance:
  • Balanced: 110Ω
  • Unbalanced: 75Ω
Connector type: Three-pin mini-terminal strip
Sample rate: 48 kHz or 96 kHz jumper selectable
November 25, 2013
Hillsboro, Ore., November 25, 2013 — Brazil's Canção Nova, a non-profit Catholic Community located in Cachoeira Paulista in the state of São Paulo, is upgrading its broadcast infrastructure with a range of Grass Valley® solutions including five Maestro™ branding and master control systems, five Concerto™ 64x64 routing switchers, five GeckoFlex™ signal processing systems, and six K2 Summit® servers for optimized live event workflows. The system will be live in November and span five locations.
November 12, 2013
Hillsboro, Ore., November 12, 2013 — Bank TV, a satellite broadcaster in the Ukraine, has launched a complete, end-to-end high definition (HD) news production solution from Grass Valley® to facilitate the smooth delivery of its 24/7programming. At the core of the broadcaster's new structure is GV STRATUS® nonlinear media production tools for enhanced production and a streamlined workflow. GV STRATUS is being used in tandem with EDIUS® multiformat nonlinear editing software and GV Edge™ Integrated Playout System with K2 Edge™ playout nodes for 24/7 playout. This deal with Bank TV builds upon the recent momentum generated by Grass Valley in the Ukrainian broadcast market as well as traction gained by GV STRATUS in the EMEA region.
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